/* ============================================ */
/* CUMULATIVE GPA CALCULATOR - COMPETITOR STYLE */
/* ============================================ */

:root {
  --bg: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: #ffffff;
  --text: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --accent: #2563eb;
  --accent-light: #dbeafe;
  --accent-dark: #1d4ed8;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  --success: #16a34a;
  --warning: #f59e0b;
  --danger: #dc2626;
}

[data-theme="dark"] {
  --bg: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --text: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border: #334155;
  --accent: #3b82f6;
  --accent-light: #1e3a8a;
  --accent-dark: #60a5fa;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1000px; margin: 0 auto; padding: 0 20px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

/* NAVBAR (kept consistent) */
.navbar { background: var(--bg-card); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 1000; box-shadow: var(--shadow); }
.nav-container { max-width: 1200px; margin: 0 auto; padding: 0 20px; display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav-logo { font-size: 1.35rem; font-weight: 800; color: var(--accent); text-decoration: none; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.hamburger { display: block; width: 24px; height: 2px; background: var(--text); position: relative; }
.hamburger::before, .hamburger::after { content: ''; position: absolute; width: 24px; height: 2px; background: var(--text); left: 0; }
.hamburger::before { top: -8px; } .hamburger::after { top: 8px; }
.nav-menu { display: flex; list-style: none; gap: 8px; align-items: center; }
.nav-menu li { list-style: none; }
.nav-menu a { padding: 8px 14px; color: var(--text); font-weight: 500; font-size: 0.95rem; border-radius: var(--radius); transition: all 0.15s ease; text-decoration: none; display: inline-block; }
.nav-menu a:hover, .nav-menu a.active { background: var(--bg-secondary); color: var(--accent); text-decoration: none; }
.nav-dropdown { position: relative; } .dropdown-toggle { cursor: pointer; }
.dropdown-menu { position: absolute; top: 100%; left: 0; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px; min-width: 260px; box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1); display: none; z-index: 100; }
.nav-dropdown:hover .dropdown-menu { display: block; }
.dropdown-category { padding: 8px 0; }
.category-label { display: block; font-size: 0.75rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; padding: 4px 8px; margin-bottom: 4px; }
.dropdown-tools { list-style: none; } .dropdown-tools li { list-style: none; }
.dropdown-tools a { display: block; padding: 6px 12px; font-size: 0.9rem; color: var(--text-secondary); }
.dropdown-tools a:hover { background: var(--bg-secondary); color: var(--accent); }
.dropdown-divider { height: 1px; background: var(--border); margin: 8px 0; }
.view-all { display: block; padding: 8px 12px; font-weight: 600; color: var(--accent); text-align: center; }
.theme-toggle { background: none; border: none; cursor: pointer; padding: 8px; font-size: 1.1rem; border-radius: var(--radius); }
.nav-theme-item { list-style: none; }
@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav-menu { position: absolute; top: 64px; left: 0; right: 0; background: var(--bg-card); flex-direction: column; padding: 20px; border-top: 1px solid var(--border); display: none; align-items: stretch; gap: 4px; }
  .nav-menu.active { display: flex; }
  .nav-dropdown:hover .dropdown-menu { position: static; display: block; box-shadow: none; border: none; padding-left: 16px; }
  .nav-menu a { display: block; width: 100%; }
}

/* HERO */
.cgpa-hero { padding: 48px 0 32px; text-align: center; background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg) 100%); border-bottom: 1px solid var(--border); }
.cgpa-hero h1 { font-size: 2.25rem; margin-bottom: 12px; font-weight: 800; }
.cgpa-hero-subtitle { font-size: 1.05rem; color: var(--text-secondary); max-width: 620px; margin: 0 auto 20px; line-height: 1.6; }
.cgpa-hero-badge { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; font-size: 0.9rem; color: var(--text-secondary); }

/* CALCULATOR */
.cgpa-calculator-section { padding: 40px 0 60px; }
.cgpa-calculator-wrapper { max-width: 800px; margin: 0 auto; }

/* PAST GPA CARD (Transfer Students) */
.cgpa-past-gpa-card { background: var(--bg-card); border: 2px solid var(--accent-light); border-radius: var(--radius); padding: 24px; margin-bottom: 24px; }
.cgpa-past-gpa-card h3 { font-size: 1.05rem; margin-bottom: 6px; font-weight: 700; color: var(--accent); }
.cgpa-past-desc { font-size: 0.88rem; color: var(--text-secondary); margin-bottom: 16px; }
.cgpa-past-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.cgpa-past-field label { display: block; font-weight: 600; font-size: 0.88rem; margin-bottom: 6px; color: var(--text); }
.cgpa-past-field input { width: 100%; padding: 10px 14px; font-size: 1rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); color: var(--text); font-family: inherit; }
.cgpa-past-field input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1); }

/* SEMESTER CARDS */
.cgpa-semesters-container { display: flex; flex-direction: column; gap: 20px; margin-bottom: 20px; }
.cgpa-semester-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.cgpa-semester-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.cgpa-semester-name { font-size: 1.05rem; font-weight: 700; color: var(--text); }
.cgpa-semester-gpa-badge { padding: 4px 12px; background: var(--accent-light); color: var(--accent); font-weight: 700; font-size: 0.85rem; border-radius: 20px; }
.cgpa-remove-semester-btn { background: none; border: 1px solid var(--border); border-radius: var(--radius); padding: 4px 10px; cursor: pointer; color: var(--text-secondary); font-size: 0.85rem; transition: all 0.15s ease; font-family: inherit; }
.cgpa-remove-semester-btn:hover { background: var(--danger); color: white; border-color: var(--danger); }

.cgpa-course-row { display: grid; grid-template-columns: 2fr 70px 100px 36px; gap: 8px; padding: 8px 0; align-items: center; }
.cgpa-course-row input, .cgpa-course-row select { width: 100%; padding: 8px 10px; font-size: 0.92rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); color: var(--text); font-family: inherit; }
.cgpa-course-row input:focus, .cgpa-course-row select:focus { outline: none; border-color: var(--accent); }
.cgpa-remove-btn { background: none; border: 1px solid var(--border); border-radius: var(--radius); cursor: pointer; width: 32px; height: 32px; display: flex; align-items: center; justify-content: center; color: var(--text-muted); font-size: 1.1rem; transition: all 0.15s ease; font-family: inherit; }
.cgpa-remove-btn:hover { background: var(--danger); color: white; border-color: var(--danger); }
.cgpa-add-course-btn { width: 100%; padding: 8px; margin-top: 8px; background: var(--bg-secondary); border: 1px dashed var(--border); border-radius: var(--radius); cursor: pointer; font-weight: 600; font-size: 0.88rem; color: var(--text-secondary); font-family: inherit; transition: all 0.15s ease; }
.cgpa-add-course-btn:hover { border-color: var(--accent); color: var(--accent); border-style: solid; }

.cgpa-add-semester-btn { width: 100%; padding: 14px; background: var(--bg-card); border: 2px dashed var(--border); border-radius: var(--radius); cursor: pointer; font-weight: 700; font-size: 1rem; color: var(--accent); font-family: inherit; transition: all 0.15s ease; margin-bottom: 32px; }
.cgpa-add-semester-btn:hover { border-color: var(--accent); background: var(--accent-light); }

/* RESULT CARD */
.cgpa-result-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
.cgpa-result-card h3 { font-size: 1.3rem; margin-bottom: 20px; padding-bottom: 12px; border-bottom: 2px solid var(--border); font-weight: 700; }
.cgpa-highlight-box { padding: 32px 24px; border-radius: var(--radius); text-align: center; margin-bottom: 24px; color: white; background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%); transition: background 0.3s ease; }
.cgpa-highlight-box.excellent { background: linear-gradient(135deg, #16a34a 0%, #15803d 100%); }
.cgpa-highlight-box.good { background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%); }
.cgpa-highlight-box.average { background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%); }
.cgpa-highlight-box.poor { background: linear-gradient(135deg, #dc2626 0%, #991b1b 100%); }
.cgpa-result-label { font-size: 0.9rem; opacity: 0.9; margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.5px; }
.cgpa-result-value { font-size: 3.5rem; font-weight: 800; line-height: 1; margin-bottom: 6px; }
.cgpa-result-subtext { font-size: 0.95rem; opacity: 0.85; }
.cgpa-breakdown-list { list-style: none; padding: 0; margin: 0 0 20px; }
.cgpa-breakdown-item { display: flex; justify-content: space-between; padding: 12px 0; border-bottom: 1px solid var(--border); font-size: 0.95rem; }
.cgpa-breakdown-item:last-child { border-bottom: none; }
.cgpa-breakdown-label { color: var(--text-secondary); }
.cgpa-breakdown-value { font-weight: 700; color: var(--text); }
.cgpa-formula-box { background: var(--bg-secondary); padding: 14px 16px; border-radius: var(--radius); font-size: 0.88rem; color: var(--text-secondary); margin-bottom: 16px; border-left: 3px solid var(--accent); }
.cgpa-formula-box code { display: block; margin-top: 6px; font-family: 'Courier New', monospace; font-size: 0.9rem; color: var(--text); font-weight: 600; }
.cgpa-copy-bar { text-align: center; }
.cgpa-copy-btn { padding: 10px 20px; background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius); cursor: pointer; font-size: 0.9rem; font-weight: 600; color: var(--text); font-family: inherit; transition: all 0.15s ease; }
.cgpa-copy-btn:hover { background: var(--accent); color: white; border-color: var(--accent); }

/* SCALE TABLE */
.cgpa-scale-section { padding: 48px 0; background: var(--bg-secondary); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.cgpa-scale-section h2 { font-size: 1.6rem; margin-bottom: 24px; text-align: center; font-weight: 700; }
.cgpa-scale-wrap { overflow-x: auto; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); max-width: 700px; margin: 0 auto; }
.cgpa-scale-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.cgpa-scale-table th { background: var(--bg-secondary); padding: 14px 16px; text-align: left; font-weight: 700; border-bottom: 2px solid var(--border); white-space: nowrap; }
.cgpa-scale-table td { padding: 12px 16px; border-bottom: 1px solid var(--border); color: var(--text-secondary); }
.cgpa-scale-table tbody tr:last-child td { border-bottom: none; }
.cgpa-scale-table tbody tr:hover { background: var(--bg-secondary); }
.row-a td:first-child, .row-a-minus td:first-child { color: var(--success); font-weight: 700; }
.row-b-plus td:first-child, .row-b td:first-child { color: #0284c7; font-weight: 700; }
.row-b-minus td:first-child, .row-c-plus td:first-child, .row-c td:first-child { color: var(--warning); font-weight: 700; }
.row-c-minus td:first-child, .row-d td:first-child { color: #ea580c; font-weight: 700; }
.row-f td:first-child { color: var(--danger); font-weight: 700; }

/* CONTENT */
.cgpa-content-article { padding: 60px 0; background: var(--bg-secondary); }
.cgpa-content-article h2 { font-size: 2rem; margin-bottom: 20px; font-weight: 700; }
.cgpa-content-article h3 { font-size: 1.35rem; margin: 32px 0 16px; font-weight: 700; }
.cgpa-content-article p { color: var(--text-secondary); line-height: 1.8; margin-bottom: 16px; }
.cgpa-content-article ul, .cgpa-content-article ol { margin-left: 24px; color: var(--text-secondary); line-height: 1.9; margin-bottom: 16px; }
.cgpa-internal-links { margin-top: 40px; padding: 24px; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); }
.cgpa-internal-links h3 { margin-top: 0; }
.cgpa-internal-links ul { list-style: none; margin: 0; padding: 0; }
.cgpa-internal-links li { padding: 8px 0; border-bottom: 1px solid var(--border); }
.cgpa-internal-links li:last-child { border-bottom: none; }
.cgpa-internal-links a { color: var(--accent); font-weight: 600; text-decoration: none; }
.cgpa-internal-links a:hover { text-decoration: underline; }

/* FAQ */
.cgpa-faq { padding: 60px 0; }
.cgpa-faq h2 { text-align: center; margin-bottom: 40px; font-size: 1.75rem; font-weight: 700; }
.faq-list { max-width: 700px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item:last-child { border-bottom: none; }
.faq-question { width: 100%; background: none; border: none; padding: 18px 0; text-align: left; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 16px; font-size: 1.02rem; font-weight: 600; color: var(--text); font-family: inherit; }
.faq-question:hover { color: var(--accent); }
.faq-icon { font-size: 1.4rem; font-weight: 300; color: var(--accent); flex-shrink: 0; line-height: 1; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-answer p { padding: 0 0 18px; color: var(--text-secondary); line-height: 1.7; font-size: 0.95rem; }

/* FOOTER */
.footer { background: var(--bg-card); border-top: 1px solid var(--border); padding: 48px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 32px; }
.footer-brand p { color: var(--text-secondary); margin-top: 12px; font-size: 0.95rem; line-height: 1.6; }
.footer-logo { font-size: 1.35rem; font-weight: 800; color: var(--accent); }
.footer-tagline { font-weight: 600; color: var(--accent); margin-top: 8px; }
.footer-nav ul { list-style: none; padding: 0; }
.footer-nav li { margin-bottom: 8px; list-style: none; }
.footer-nav a { color: var(--text-secondary); font-size: 0.92rem; text-decoration: none; }
.footer-nav a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid var(--border); padding-top: 20px; text-align: center; color: var(--text-muted); font-size: 0.88rem; }
.footer-privacy { margin-top: 6px; font-size: 0.82rem; }

/* RESPONSIVE */
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr; gap: 24px; } }
@media (max-width: 640px) {
  .cgpa-hero { padding: 32px 0 24px; } .cgpa-hero h1 { font-size: 1.75rem; }
  .cgpa-result-value { font-size: 2.5rem; }
  .cgpa-past-grid { grid-template-columns: 1fr; }
  .cgpa-course-row { grid-template-columns: 1fr 55px 80px 32px; gap: 6px; }
  .cgpa-course-row input, .cgpa-course-row select { padding: 8px 6px; font-size: 0.85rem; }
  .cgpa-semester-card { padding: 16px; }
  .cgpa-scale-table th, .cgpa-scale-table td { padding: 10px 12px; font-size: 0.85rem; }
}